Carbon paper



J ly-.15 1924.

1,501,535 J. WALDHEIM CARBON PAPER Original Filed Jan. 37. 1920 PatentJuly 15, 1924.

o STATES.

PATENT OFFICE.

JOHN WALDHEIM, or ELIZABETH, NEW JERSEY, nssIGNoR 'ro uNnERwoon mn-WRITER COMPANY, on NEW YoRK,-N. Y., A CORPORATION or DELAWARE.

CARBON PAPER.

Original application filed January 27, 1920, Serial No. 354,475. Dividedand this application file February 12, 1921.

To all whom it may concern:

Be itknown that I, JOHN WALDHEIM, a citizen of the United States,residing in Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Carbon'Paper, ofwhich the following is a specification.

This invention relates to carbon-sheets or duplicating material to beused between work-sheets in manifolding upon a typewriting machine. Theinvention may be used in connection with combined typewriting andcomputing machines which perform addition and subtraction.

It is customary intypewriting machines to use a bichrome ribbon havingblack and red color-stri es, and, when a computing de vice is used, t eribbon mechanism is usually connected to the computing mechanism in sucha way that any numbers that are subtracted are typed in red upon theworksheet; thus the work-sheet bears its own evidence that such numbershave been subtracted by the computing mechanism.

This expedient, however, has been necessarily limited to the singlesheet upon which the ribbon directly prints; and the difliculty hasexisted that on the carbon copies, which are almost invariablymanifolded at the same time as the ribbon copy, there is nothingtoindicate whether any particular number has been written in black or inred; that is to say, in computing, there is nothing to indicate whetherithas been added or sub tracted by the computing mechanism.

Many efforts have been made to avoid this difliculty. It has beenproposed to have large figure types in typewriting-computing machines,which are called into use only when subtraction is being performed bythe computing mechanism, so that the carbon copies will show by thelarge figures thereon that certain numbers were subtracted.

It has also been proposed to print a special sign before each numberthat is to be subtracted, so that the carbon copies shall glve evidenceaccordingly.

It has also been proposed that a special mark shall beprinted under eachdigit that is typed, where such digits are subtracted.

The object of my invention 1s to provide for a distinction to be madeupon the carbon copies of the main or origmal worksheet, withoutnecessitating the use of a Serial No. 444,307.

special set of types, or a special sign or other special device ormechanism in the typewriting machine.

To attain this end and other ends, I provide means whereby thecharacters typed in certain columns upon the work-sheet are typed in adistinctive color on the carbon bon-sheet, the remaining portion beingthe normal color of the carbon.

For the purpose of keeping the carbonoverlying strip in accuratealignment and register with the desired column u on the work-sheet, thecarbon-sheet may be astened thereto in such a way that the sheet andstrip play the part 'of an integral sheet. The carbon-sheet may be ofthe usual width in some cases, that is to say, the width of thework-sheet, with the result that, if, the carbon-sheet is properlyinserted in the usual manner, the strip will fall upon the propercolumn.- To enable the strip to be adjusted to the proper columnlaterally of the sheet, the carbon-sheet may be provided folding strip,may be a strip adapted to prevent the carbon imprint from appearing onthe manifold copy.

This is a division of my application, Serial No. 354,475, filed January27,1920.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a diagrammatic perspective view of an Underwood typewritingmachine platen, showing a carbon-sheet embodying the present inventionin use.

Figure 2 is a face view of the sheet seen in Figure 1.

Figure 3 is a face View of a similar sheet, but adapted to be used tomodify the manifolded work upon certain writing lines instead of invertical columns.

Figure 4 is a view of a fragment of a carbon-sheet, showing how thedetachable strip may be mounted thereon.

When it is desired to make a carbon copy upon a work-sheet 10 of thematter to be typed upon an original sheet 11, there is interposedbetween the two, before insertion into the machine, a carbon-sheet 12,so

that the sheets 10, 11 and 12 are fed together around the platen 13,being held thereto by the usual feed-rolls 14. This enables type-bars15, striking through a ribbon 16, to print not only upon the outer sheet11, but also upon the inner sheet 10, the characters carried by thetype-bars 15. Normally, the types print through a black stripe 17 of theribbon 16, but, under some circumstances, that is to say, in somecolumns, the red stripe 18 of the ribbon 16 causes red characters to beprinted u on the outer work-sheet 11. To enable the characters printedby the red stripe 18 to be shown in red, the carbon-sheet 12 is adaptedto hold a strip of red manifolding paper 20 at the column where the redprinting is effected.

To enable the strip 20 to be held in place overlying the proper columnof the sheet 12, its opposite ends are herein shown as threaded throughslits or openings 21 in extensions 22 lying outside of therep-roducing'surface 23, which forms the main body of the sheet 12. Tohold the strip 20 accurately in place, it may fit the slits 21 ratherclosely. When thus held, its reproducing surface lies next to thework-sheet 10, thus "causing the characters typed upon that worksheet toappear inred, i. e., in the color of the strip. Any typed mark of thereproducing surface 23 in this column is received upon. the back of thestrip 20, and therefore fails to appear upon the worksheet 10.

In order to prevent the strip 20 from slip ping out of the slits 21, theend of the strip may be bent over or folded back as at 24, thus enablingthe strip 20 and sheet 12 to be handled as a unitary structure. If it isdesired that characters typed upon one column of the work-sheet 11 shallnot appear upon the carbon copy 10, a blank strip 25 may be threadedthrough other openings 21 and have its end turned back as at24, so thatit will not interfere with the ready handling of the carbon-sheet 12 anymore than does the strip 20.

Where it is desired to provide a carbonsheet 12 which shall be used formany kinds of work, there may be provided, in addition to the outerslits or openings 21, inner slits 26 offset or staggered relatively tothem. In some cases it may be found more convenient to omit one or bothof the extensions 22, and have the slits 21 or 26, or both, suitablyplaced elsewhere on the carbon-sheet.

It will be noted that the sheet 12, shown in Figure 2, has the strips 20and 25 at the left, while, as shown in Figure 1, the strips are at theright. This is because Figure 1 is a back view of the carbon-sheet,while Figure 2 is a front view.

Where it is desired to omit from a worksheet 10 characters appearingupon certain writing lines of the original work-sheet 11, a carbon-sheet27, like that shown in Figure 2, may be used, having, if desired, a sideextension 28 at each side in which the slits or openings 21 areprovided, so that blank strips 25 and contrasting color strips 20 may beheld in position, as upon the carbon-sheet 12.

In Figure 3 is also shown a wide strip 29, which is held in position byextensions 30 narrower than the strip but adapted to fitclosely in theslits or openings 21 and 26, thus enabling a carbon-sheet 12 or27,having slits for one width of strip, to be used with other wider strips,since extensions 30 can easily be made to fit any desired or standardsize of slits 21 or 26.

To mount the strips 20 or 25 on the carbon-sheet indicated by 12 inFigure 4:, the carbon-sheet may be provided with projections 26 to passthrough perforations 26 in stri 20 The projections 26 may be folded overto retain the strip 20 on the carbon-sheet 12 Variations may be resortedto within the scope of the invention, and portions of the improvementsmay be used withoi't others.

Having thus described my invention, 1, claim:

1. A manifolding sheet comprising a carbon-sheet having a perforation,and a narrower overlying sheet connected to the carbon-sheet by a partpassing through the perforation and holding said narrower sheet inposition over the carbon-sheet to prevent the underlying portion of thecarbon face of the carbon-sheet from contacting with a work-sheet.

2. A carbon-sheet having means, including a plurality of perforations,for holding the opposite ends of a narrower overlying sheet, to hold thelatter in place, and to prevent the underlying surface of thecarbonsheet from contacting with a work-sheet.

3. The combination with a carbon-sheet hishaving a slit, of a narrowstrip having a difi'erent surface and overlying said sheet so as toprevent a portion thereof from contacting with a work-sheet, said striphaving an end passed, through said slit to hold it.

4. The combination with a carbon-sheet having a plurality of perforatedslits at each end, of a strip having a manifolding surface of adifferent color, and insertible in said slits to be held in positionthereby and overlie a section of the surface of the carbon-sheet, tobecome a substitute for the manifolding surface.

5. The combination with a carbon-sheet having extensions provided withslits, of a strip lnsertible in various pairs of said slits to overliedifferent selected sections of the carbon surface of the sheet, toprevent portions of the surface of the carbon-sheet from contacting witha worksheet, said strip having a manifolding surface of a different coor 6. The combination with a carbon-sheet having an end extensionprovided with slits, of a strip insertible in one of said slits tooverlie a strip of the carbon surface of the sheet, to prevent thesurface of the carbonsheet from contacting with a work-sheet.

7 The combination with a carbon-sheet having an end extension providedwith offset slits, of a strip insertible in any of a plurality of saidslits to overlie any one of a plurality of strips of the carbon surfaceof the sheet, to prevent a selected strip from contacting with awork-sheet. a,

8. The combination with a carbon-sheet having a black reproducingsurface, of an extenslon of the sheet having staggered openings therein,and a strip having a red reproducing surface insertible in any of saidopenings to overlie selected portions of the black sheet surface.

9. The combination with a carbon-sheet having a black reproducingsurface," of an extension at each end of the sheet, each extensioncomprising staggered openings so that they are paired ofl with eachother, and

a strip insertible selectively in said extension to overlie a stripe ofthe reproducing surface to keep it from contact with a worksheet.

10. A manifolding sheet comprising a carbon-sheet and a detachable sheetconnected to the carbon side of the carbon-sheet, said detachable sheetoverlying a portion only of the carbon-face of the carbon-sheet so ,asto leave another portion of the carbon-face having reduced extensions tofit into the u perforations.

13. A manifolding sheet having a carbonface, in combination with asuperposed strip formed to present a manifolding surface having a colordifferent from that of, the carbon-face of the manifoldin sheet, saidsuperposed strip being adjusta le relatively vto the manifolding sheet.

I 14. A manifolding sheet comprising a main carbon-faced sheet and anoverlying sheet mounted on the'carbon-face of the main sheet and beingof less width than the carbon-sheet to expose a portion of itscarbon-face, and connections between the end portions of the overlyingsheet and the ends of the main sheet for causing the overlying sheet tomove as a unit with the main sheet when it is laid with its carbon-faceagainst a work-sheet.

15. A manifolding sheet comprising a main carbon-faced sheet and a sheetdetachably connected to the carbon side of the main sheet, saiddetachable sheet being of less width than the main sheet and having oneof its side edges spaced inwardlyl from the corresponding edge of themain s as to leave a portion of the carbon-face of the main sheetexposed, and said detachable eet sosheet being movable as a unit withthe main sheet when it is laid with its carbon-face against awork-sheet.

16. A 'manifolding sheet comprising a main carbon-faced sheet and asheet on the carbon-face of the main sheet and being of less width thanthe main sheet to e a portion of its carbon-face, and connectionsbetween the overlying sheet and the main sheet for causing the overlyingsheet to move as a unit with the main sheet.

JOHN WALDHEIM.

Witnesses:

CATHERINE A. NEWELL, EDITH B. LIBBEYQ

